thumb|Pater Moeskroen at the Zwarte Cross festival in July, 2022 Pater Moeskroen is a Dutch folk group. During the summer they tour the country to play at festivals and big parties; in the winter the
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6860c5e46777c593a9be488f472adf732013e85320a7180ec7807529e06dfae9. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3407ad5c-f74f-4116-974e-556fcdc27a3d.json and https://artists.proofprofile.net/proofs/artist/3407ad5c-f74f-4116-974e-556fcdc27a3d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d2b1d7f1a28bd9519f262075fca30514f49f495e3dd1e5c5bfa3b2146312def. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BEJ039601527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf12033826423f15a246a82d16c919c4ced5f9c485c6a4e7537949f1c16ca7aef. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-22T00:04:42Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BEJ039601528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x984bb61414b184d195352bcae35f9b033192673dcec827b7fdccef16749dc129. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BEJ039601529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c16b9ac5b9949c5899a8e66de03e2aa9732fbf453f9df009af5fcce9cf25321. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BEJ039601530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63cec602c05b8d641858a02f09d1d0a7c5595bf0eda2b910cfa3e73bb8eb49fc. Chain 2 (Bitcoin): anchored in block 958903 (2026-07-20T18:11:40Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BEJ039601532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3011acf3a2cbd52165e4c41649219cb21236cb0ab4a6c98c5fc1b059182e6536. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BEJ039601533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb87630606b805d4bb497be309e5e61a386cab1af9d396653f66a1ae4533b6a5. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BEJ039600530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd138d161822c2283708cd410fb7bde20a279457c54d551764ba8c35449977b52. Chain 2 (Bitcoin): anchored in block 958673 (2026-07-19T05:38:28Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BEJ039600536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3deb1bedd4a11b21d66cff15a5b94cf6b399b22d3b79b01eef18b2588af323d1. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BEJ039600537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea6a6dc156c5ae0fc8e9566863b582740013b4a230161e93084e7ea394b71b88. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BEJ010000290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea82d57059587dec522a3cd95950a4ed019e6246f381e35da15e3bc437d89783. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T05:04:02Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BEJ010000291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0a7bf28965e7105d5a23a68639b145091e47fae5ad3d5685c750ef81d7a77a1. Chain 2 (Bitcoin): anchored in block 958670 (2026-07-19T05:26:23Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BEJ010000292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6779c55a484f397d51d74118eb70e85bcf698676ed64f7affff80a5cbccf6e82. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BEJ010000293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcec65f5e111ddc5a7817d1436af74252e29805edf12e8237406f8f17374fea62. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T21:48:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BEJ010000296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc13252887e0f4ad95af288a39183047d5d94c20478f457e8aa3bf72999a62c7. Chain 2 (Bitcoin): anchored in block 957564 (2026-07-11T12:19:47Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BEJ010000297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a86b1d50b03057f81d1f8f0c1f53a7cdb892e492865ef87a2d961a2a161e612. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLM291000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f5ee8155c297bbba3a607023f2a42ed49b938b3a98a10555457a7dfd1e9b37a. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLM291000004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc1c47081f90fe803f36fe2dc0c10d35fd311d84a15b8f59bbf516f8f5eca9d2. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLM291000005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36fbd666868aefc6a6cd3df93747b23469bdf0ebab350a6eed0805aada2a7462. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLM291000010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc17e0830b1a6656788d290f70ba547cea596fe0719968181c8f97ef6e0a6205c. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLM291000011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c9302e03b485281a5418519a13626ab5c865405471982bc7d8e40c07e604e96. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T09:54:30Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLM291100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x516abf007de47f2cfbd4018a02b2b2928075ca4ccf280132988ba0af1ed80f77. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLM291200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab8fad39f8a4144e0f12fca3ef251908cf5ba76b6f2f0fb0cc8a27c8af92f285. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLM291200019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x227127efcaacf554080a72066c8893ea2196a143211e6e86917ec23302c0b387. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLM291500024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5ea7144c96b64b89129435d8a6345b5eb52c72d2b8b4e14ecc539897af4be9b. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLM291500027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x969c1cb10a3eb2e86f11479ba764c9ebcbcc4396aa9485efb6dd1ddc43949759. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLM291700003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fdb2801622fdefc664f54ba923987c85743ade106afa4049e68189630667a76. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLM291700006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0882051c9eacabd965e5fa060b9005c34152d1e8bf2825579aa43c4384e62b7. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLM291700008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bdc0f74636d48658213a6dad9de1c8b86990383c5b9990626bb292916eab8c2. Chain 2 (Bitcoin): anchored in block 958785 (2026-07-19T21:40:06Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLM291700009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbdba6fd65cea6c576fdf7117ad46492cab78aae560264d5570dc9e39251d1c6. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T04:39:22Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLM291700013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x134183f219411f9687b869561b87d2c819d423d42bc83a8b09b6df163a47f6c8. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T10:42:21Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLE871727001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8e7b4a68438c7a96e588aee0fdd808caf49cd9b9c9ab6dba22762c0014f2153. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLM291900001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4e000177aedb760ef002541d01271bef291eae443f6b1313304d389d427990d. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLM291900002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6eec90abb9c395d7ea8b5a9788fb6669558ffec83eec5a5d03ce5b75db7192f1. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLM291900003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e5acac35762431b938a438d44ac708f61e8a9716cf68883d63e56e83173a8fc. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLM291900004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3999528e07fa8e9211545ea4f1c401e9f9d10a986b1efc92abbac599188acb0. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLM291900005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ee3151a167679994163ed24a7f34b379e09d1d7d25af93857077167e0abeef7. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLM291900006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd403243baa4c3a1490f08c7f8e9a06e823b8e1001226cbb88669c7b01eb155d9. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-22T00:00:18Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLE871937200.